This is a reland of b18e868aa4375351cacd79efeb519b123878c39a
Original change's description:
> Implement RTC_DLOG macro and use in a few places to test.
>
> Bug: webrtc:8529
> Change-Id: I31a5a4ec873088b1831dfa31a496467efff89cc1
> Reviewed-on: https://webrtc-review.googlesource.com/23041
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Reviewed-by: Tommi <tommi@webrtc.org>
> Commit-Queue: Fredrik Solenberg <solenberg@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#20690}
Bug: webrtc:8529
Change-Id: I68073870945f3085966e7a61fe6efa083eedd100
Reviewed-on: https://webrtc-review.googlesource.com/23361
Commit-Queue: Fredrik Solenberg <solenberg@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20725}